const CRC16Data = [
    0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, 0x9cc9, 0x8d40, 0xbfdb,
    0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e,
    0x54b5, 0x453c, 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, 0x5285,
    0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, 0xef4e, 0xfec7, 0xcc5c, 0xddd5,
    0xa96a, 0xb8e3, 0x8a78, 0x9bf1, 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e,
    0xf0b7, 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, 0xa50a, 0xb483,
    0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7,
    0x6e6e, 0x5cf5, 0x4d7c, 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
    0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, 0xf78f, 0xe606, 0xd49d,
    0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
]

//获取流水号
function getSequenceId(sequenceId) {
    if (sequenceId > 255) sequenceId = 0
    const n = sequenceId.toString(16)
    const s = `00${n}`
    return s.substr(n.length, s.length) // 截取最后2位字符
}

function getPayLoadLength(content) {
    const c = (content.length / 2).toString(16)
    const s = `0000${c}`
    return s.substr(c.length, s.length)
}

//转成四个字节数据
function turnFourBytesDatas(content) {
    const c = content.toString(16)
    const s = `00000000${c}`
    return s.substr(c.length, s.length)
}

//获取秘钥长度
function getSecretKeyLength(content) {
    const c = (content.length / 2).toString(16)
    const s = `00${c}`
    return s.substr(c.length, s.length)
}

function getCRC16(content) {
    let mCrc = 0xffff
    //[0x03, 0x00, 0x82, 0x01, 0x00]
    content.forEach(function (value, index, array) {
        mCrc = (mCrc >>> 8) ^ CRC16Data[(mCrc ^ value) & 0xff]
    })

    const value = (~mCrc & 0xffff).toString(16)
    const s = `0000${value}`

    return s.substr(value.length, s.length)
}

//数据包请求头,ack
function header(sendData, ack, systemState, sequenceId) {
    const payLoadLength = getPayLoadLength(sendData.toString().replace(/\s+/g, ""))

    const contentArr = Array.prototype.map.call(sendData.split(" "), function (value) {
        return `0x${value}`
    })

    const CRC16 = getCRC16(contentArr).toLowerCase()

    /*
 ack 0 ,1,反馈为1，发送为0
 systemState,反馈为带过来的值，发送为00
 sequenceId,为流水号，自增
 payLoadLength,数据包的长度
 CRC16,数据包经过CRC算法得到的结果
  */

    const header = `aa${ack}2${systemState}${sequenceId}${payLoadLength}${CRC16}`
    return header
}

//数据包
function content(secretKey, sendValue) {
    if (secretKey.length == 0) return sendValue
    else return `${secretKey}${sendValue}`
}

//TID号加密解密算法描述
//466fe489d=>70537421
const szKey3 = [0x35, 0x41, 0x32, 0x42, 0x33, 0x43, 0x36, 0x44, 0x39, 0x45, 0x38, 0x46, 0x37, 0x34, 0x31, 0x30]
//解密 ，参数16进制
const encrypt = number => {
    number = number.toUpperCase()
    let out_number = ""
    if (!number) return
    const len = number.length

    if (len > 16) return
    for (let i = 0; i < len; i++) {
        for (let j = 0; j < 16; j++) {
            if (number.charAt(i).charCodeAt() == szKey3[j])
                //字符转ascii码
                out_number += String.fromCharCode(0x2a + j)
            else ;
        }
    }
    return out_number
}

const stringToHex = str => {
    let val = ""
    for (let i = 0; i < str.length; i++) {
        if (val == "") val = str.charCodeAt(i).toString(16)
        else val += " " + str.charCodeAt(i).toString(16)
    }
    return val
}

// ArrayBuffer转16进度字符串示例
const ab2hex = buffer => {
    console.log("ab2hex", buffer)
    const hexArr = Array.prototype.map.call(new Uint8Array(buffer), function (bit) {
        return ("00" + bit.toString(16)).slice(-2)
    })
    return hexArr.join("")
}

//字符串平均切割成数组
const strAverage2Arr = (str, no) => {
    const arr = []
    for (let i = 0; i < str.length; i += no) {
        arr.push(str.slice(i, i + 2))
    }
    return arr
}

//数组的每个元素加前缀
const addFlagBeforeArr = arr => {
    return Array.prototype.map.call(arr, function (value) {
        return `0x${value}`
    })
}

//字符转ArrayBuffer
const hexStringToArrayBuffer = str => {
    // 将16进制转化为ArrayBuffer
    return new Uint8Array(
        str.match(/[\da-f]{2}/gi).map(function (h) {
            return parseInt(h, 16)
        })
    ).buffer
}

const formatNumber = function (n) {
    n = n.toString()
    return n[1] ? n : "0" + n
}

const formatTime = function (date) {
    const year = date.getFullYear()
    const month = date.getMonth() + 1
    const day = date.getDate()
    const hour = date.getHours()
    const minute = date.getMinutes()
    const second = date.getSeconds()

    return [hour, minute, second].map(formatNumber).join(":")
}

const transLonLat = function (data) {
    const data1 = Math.floor(parseInt(data) / 1800000)
    const data2 = parseInt(data) / 30000 - data1 * 60
    return data1 + data2 / 60
}

const hextoString = function (hex) {
    const arr = hex.split("")
    let out = ""
    for (let i = 0; i < arr.length / 2; i++) {
        const tmp = "0x" + arr[i * 2] + arr[i * 2 + 1]
        const charValue = String.fromCharCode(Number(tmp))
        out += charValue
    }
    return out
}
export default {
    header: header,
    content: content,
    getCRC16: getCRC16,
    getSequenceId: getSequenceId,
    getSecretKeyLength: getSecretKeyLength,
    getPayLoadLength: getPayLoadLength,
    encrypt: encrypt,
    ab2hex: ab2hex,
    strAverage2Arr: strAverage2Arr,
    addFlagBeforeArr: addFlagBeforeArr,
    hexStringToArrayBuffer: hexStringToArrayBuffer,
    formatTime: formatTime,
    formatNumber: formatNumber,
    transLonLat,
    stringToHex,
    hextoString,
    turnFourBytesDatas
}
